jQuery update.

This adds one line of code to the index.html. It is regarding adding jQuery to the html page. 
You are linking to `1.9.1`.

Currently jQuery 1.x has version `1.11.1` and jQuery 2.x has `2.1.1`.
So not only is this not the latest version of jQuery... (you're using jQuery 1 instead of jQuery 2), it's not the latest version of jQuery 1 either. :P

[Source](http://code.jquery.com/)